Gray was stretchered from the ground at Optus Stadium after being dumped head first in a tackle by Fremantle's Ryan Nyhuis early in the third quarter and did not return.

He also has a good chance of missing this week's clash against GWS due to concussion.

Asked about the incident on Monday morning and whether it warranted a red-card system being introduced, Jenkins said he did not have an opinion one way or another but believes it should be considered.

"My first thought would be no, but when you see a Harris Andrews or a Robbie Gray get the game ended. It affected Port big time yesterday because they'd already had an injury to a big player," Jenkins said.

"Irrespective of whether you consider the player injured one of the best or worst you're still down. And I remember looking at the stats last night and Port had only used about 50 rotations because they couldn't get guys on and off the field.

"It has a big impact so it's something worth talking about. I think it should be discussed but I don't have an opinion either way.

Robbie Gray is slammed into the turf by Ryan Nyhuis.

"You could link it up with 'you can't come back until that person you've injured comes back'. There's a lot to work through but I'm not opposed to it."

Jenkins was also asked about captain Taylor Walker's bump on Geelong's Zach Tuohy which drew a one-game ban.

"The one thing that strikes me is how quick it happens and that's not an excuse by any stretch of the imagination but it just happens so damn fast," he said.

"You make split second decisions on how to use the ball, whether to tackle, and they happen that fast you go straight away 'why did I do that or why didn't I do this?' But you can never underestimate how fast things happen out there."

It's not yet known whether the Crows will challenge Walker's ban or Bryce Gibbs' $2000 fine for a bump on Joel Selwood.